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Finding the Fourth Proportional to 690.83, 953.34 and 380.33

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Solution

The fourth proportional to 690.83, 953.34 and 380.33 is: 524.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.83 : 953.34 = 380.33 : x
  2. Step 2: Convert to fraction form
    690.83/953.34 = 380.33/x
  3. Step 3: Cross multiply
    690.83x = 953.34 × 380.33
  4. Step 4: Simplify right side
    690.83x = 362,584.40
  5. Step 5: Solve for x
    x = 362,584.40/690.83
  6. Step 6: Final answer
    x = 524.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.